Boost system including hybrid drive supercharger with compact configuration

A boost system for providing boost pressure to an air intake manifold of an engine, the boost system comprising:

• a supercharger having rotors and a supercharger input shaft;
• an electric motor/generator including a drive shaft;
• a planetary gear set for transferring torque between the supercharger input shaft, the electric motor/generator and a crankshaft of the engine, the planetary gear set including a sun gear, a ring gear and a carrier that carries planetary gears, the carrier, the sun gear and the ring gear being configured to rotate about a central axis of the planetary gear set, and wherein the drive shaft of the electric motor/generator rotates about the central axis of the planetary gear set
• wherein the electric motor/generator is generally axially in-line with the planetary gear set and the supercharger;
• wherein the carrier is coupled to a pulley that is coupled to the engine crankshaft;
• wherein the electric motor is positioned along the central axis at a location between the sun gear and the pulley;
• wherein the carrier is coupled to the pulley by a torque transfer shaft aligned along the central axis of the planetary gear set, the drive shaft of the electric motor/generator being hollow and the torque transfer shaft passing through the drive shaft of the electric motor/generator, the torque transfer shaft and the drive shaft being rotatable relative to one another about the central axis of the planetary gear set, and the torque transfer shaft being adapted to rotate in unison with the carrier about the central axis of the planetary gear set.

A boost system for providing boost pressure to an air intake manifold of an engine, the boost system comprising:

• a supercharger having rotors and a supercharger input shaft;
• an electric motor/generator;
• a planetary gear set for transferring torque between the supercharger input shaft, the electric motor/generator and a crankshaft of the engine, the planetary gear set including a ring gear coupled to the electric motor/generator, a sun gear coupled to the supercharger input shaft, and a carrier coupled to a pulley that couples to the engine crank shaft, the ring gear, the sun gear and the carrier being rotatable abut a central axis;
• a clutch connected to the supercharger input shaft at a location such that the rotors are between the clutch and the planetary gear set and
• the electric motor/generator having a rotation member that rotates about a motor axis that is perpendicular relative to the central axis.

A boost system for providing boost pressure to an air intake manifold of an engine, the boost system comprising:

• a supercharger having rotors and a supercharger input shaft;
• an electric motor/generator;
• a planetary gear set for transferring torque between the supercharger input shaft, the electric motor/generator and a crankshaft of the engine, the planetary gear set including a ring gear coupled to the electric motor/generator via a hollow drive shaft, a sun gear coupled to the supercharger input shaft, and a carrier coupled to the crankshaft via a torque transfer shaft passing through the hollow drive shaft, the ring gear, the sun gear and the carrier being rotatable abut a central axis;
• and
• a multi-speed gear set for allowing multiple gear ratios to be used to transfer torque between the crankshaft and the planetary gear set.